Certified Rhythm Analysis Technician (CRAT) Practice Exam

Question: 1 / 400

What is the main cause of sinus arrhythmia in adults?

Respiration

Sinus arrhythmia in adults is primarily influenced by the respiratory cycle. During inhalation, there is a slight increase in heart rate, whereas during exhalation, the heart rate decreases. This fluctuation is a normal physiological response and reflects the autonomic nervous system's regulation of the heart, particularly the balance between sympathetic and parasympathetic activity.

Respiration is directly tied to the varying demands for oxygen and the metabolic processes occurring during breathing. The influence of respiration on heart rate is most pronounced in young individuals but can still be observed in adults. While other factors such as electrolyte imbalances, ectopic beats, or external stimulants like caffeine can affect heart rhythm, they do not contribute to the typical respiratory-related variations seen in sinus arrhythmia.

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Hypokalemia

Ectopic beats

Caffeine intake

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